Allocated but unannounced space
Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.
“Unannounced” does not mean “unused”
Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.
It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.
Browse by registry
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,248 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.161.233.0/24 | 256 | ARIN |  CA | 14th Dec 1993 |
| 198.161.236.0/24 | 256 | ARIN | CA | 30th Jun 1994 |
| 198.161.241.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.161.242.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.161.249.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.161.252.0/23 | 512 | ARIN | CA | 14th Dec 1993 |
| 198.161.5.0/24 | 256 | ARIN | CA | 4th Jun 1993 |
| 198.161.64.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.65.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.66.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.67.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.68.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.69.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.7.0/24 | 256 | ARIN | CA | 9th Sept 1993 |
| 198.161.70.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.71.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.72.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.73.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.74.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.75.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.76.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.77.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.78.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.79.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.80.0/24 | 256 | ARIN |  US | 3rd Aug 1993 |
| 198.161.92.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.161.93.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.161.94.0/23 | 512 | ARIN | CA | 14th Dec 1993 |
| 198.162.10.0/24 | 256 | ARIN | CA | 4th Oct 1993 |
| 198.162.11.0/24 | 256 | ARIN | CA | 12th Oct 1993 |
| 198.162.120.0/22 | 1k | ARIN | CA | 23rd Sept 1993 |
| 198.162.127.0/24 | 256 | ARIN | CA | 17th Dec 1993 |
| 198.162.14.0/23 | 512 | ARIN | CA | 2nd Dec 1993 |
| 198.162.144.0/21 | 2k | ARIN | CA | 6th Dec 1993 |
| 198.162.152.0/23 | 512 | ARIN | CA | 6th Dec 1993 |
| 198.162.154.0/23 | 512 | ARIN | CA | 7th Dec 1993 |
| 198.162.159.0/24 | 256 | ARIN | CA | 28th Oct 1993 |
| 198.162.2.0/24 | 256 | ARIN | CA | 12th Aug 1993 |
| 198.162.224.0/24 | 256 | ARIN | US | 15th Oct 1993 |
| 198.162.230.0/24 | 256 | ARIN | US | 13th May 2013 |
| 198.162.231.0/24 | 256 | ARIN | CA | 11th Mar 1994 |
| 198.162.236.0/24 | 256 | ARIN | CA | 18th Jan 1994 |
| 198.162.237.0/24 | 256 | ARIN | CA | 22nd Mar 1994 |
| 198.162.238.0/24 | 256 | ARIN | CA | 22nd Mar 1994 |
| 198.162.239.0/24 | 256 | ARIN | US | 29th Mar 1994 |
| 198.162.240.0/21 | 2k | ARIN | CA | 4th Nov 1993 |
| 198.162.248.0/22 | 1k | ARIN | CA | 3rd Mar 1994 |
| 198.162.252.0/23 | 512 | ARIN | CA | 3rd Mar 1994 |
| 198.162.254.0/24 | 256 | ARIN | CA | 28th Mar 1994 |
| 198.162.4.0/24 | 256 | ARIN | CA | 1st Sept 1993 |